Abstract This note examines one of the most crucial questions in causal inference: “How generalizable are randomized clinical trials?” The question has received a formal treatment recently, using a non-parametric setting, and has led to a simple and general solution. I will describe this...

Sound marketing decisions often require understanding the cause-and-effect relationships between treatment and outcomes. Market research traditionally approaches such questions by designing randomized experiments that aim to isolate the effects of the specific treatment from other effects. We...

In recent years an increasing amount of efforts has been devoted to the evaluation of geographically-targeted economic development (GTED) programs. In the U.S. and in Great Britain, geographically-targeted business incentives (denominated Enterprise Zone programs) are an important policy...

This paper measures profit efficiency and examines the effect of access to microfinance on theperformance of rice firms in Bangladesh. An extended Cobb-Douglas stochastic frontier profit function wasused to assess profit efficiency and profit loss of rice farmers in Bangladesh in a survey data...

This paper investigates the determinants of participation and performance of tobacco contract farmers, and the effects of participation on overall crop and household incomes in the Zambezi Valley of Mozambique. We test the existence of threshold effects in land holdings and educational...

Background: In this paper we propose the use of the within-subject coefficient of variation as an index of a measurement's reliability. For continuous variables and based on its maximum likelihood estimation we derive a variance-stabilizing transformation and discuss confidence interval...

In this paper, we estimate a structural model of choice of field of study by community college students. We use data from the Canadian Survey of Graduates for 12,871 individuals who successfully completed their programs in Canadian community colleges (CEGEPs in Quebec) in 1990 and 1995. Over...

This paper exploits the rapid rise in self-employment rates in post-communist Eastern Europe as a valuable ?quasi-experiment? for understanding the sources of entrepreneurship. A relative demand-supply model and an individual sectoral choice model are used to analyze a 1993 survey of 27,000...

This study analyses the effects of public sector sponsored vocational training on individual unemployment and employment duration in East Germany. The data is taken from the German Socio-Economic Panel (GSOEP). The empirical analysis is limited to training measures that took place between July...

We address the problem of maximally selected chi-square statistics in the case of a binary Y variable and a nominal X variable with several categories. The distribution of the maximally selected chi-square statistic has already been derived when the best cutpoint is chosen from a continuous or...